[vtkusers] Translating and rotating PolyData

[Dmitri Danewitz]

Hello David,
 
thanks a lot for the example, but there it looks like a new polyData is created. I read mine from a VTK file.
 
Here is an example of the VTK file. The values are already there, I just want to change the point coordinates and I managed to extract the point coordinates from the VTK and changed them. Then I put them into the polyData again but then I'm stuck, putting the polyData back into the object where I took it from. Here is an example of my code:
 
 
Reader[0]->SetFileName("D:/VTKzeug/room3D/temperature.vtk"); 
Reader[0]->Update();

//Now making a 2D plane, to make a cut through the room
plane = vtkPlaneSource::New();
plane->SetResolution(((int)sqrt(tempForRes))*resolutionFactorX,((int)sqrt(tempForRes))*resolutionFactorY);
plane->SetOrigin(linex1, liney1, linez1);
plane->SetPoint1(linex2, liney2 , linez1);
plane->SetPoint2(linex1, liney1, linez2);
probe = vtkProbeFilter::New(); 
probe->SetInput(plane->GetOutput()); 
probe->SetSource(Reader->GetOutput());
probe->Update();
//Now changing the point-coordinates with own calculation 
//(I rotate the points and translate them) The values remain the same
PolyDat = vtkPolyData::New();
PolyDat = probe->GetPolyDataOutput();
numberOfCells=PolyDat->GetNumberOfPoints();
data = vtkPolyData::New();
scalars = vtkFloatArray::New();
points = vtkPoints::New();
for (int i = 0; i < numberOfCells; i++)
{
 scalars->InsertTuple1(i, PolyDat->GetPointData()->GetScalars()->GetTuple(j));
//deleted the stuff here to calculate the new coordinate values
 points->InsertPoint(i, newX, nexY, newZ);
}
//I take the new point-coordinates, as well as the unchanges scalars to the vtkPolyData 
//and now don't know how to take them into the vtkPlaneSource probe again
PolyDat->SetPoints(points);
PolyDat->GetPointData()->SetScalars(scalars);

 
 
... I don't know if there is a class that provides simple translating and rotating the points of the polyData, so I did it manually. But now I can not bring the polyData back to the vtkPlaneSource plane for visualising it.
 
Greets
Dmitri

--- David Doria <daviddoria+vtk at gmail.com> schrieb am Di, 4.8.2009:


Von: David Doria <daviddoria+vtk at gmail.com>
Betreff: Re: [vtkusers] Translating and rotating PolyData
An: vtkusers at vtk.org
Datum: Dienstag, 4. August 2009, 14:00











Hello David,
 
I'm not sure if i explained it right. First I read a VTK file, in which is a rectilinear grid in 3D. And every point of the grid has its value (scalar) (for example, in a 3D room each value is a temperature at its coordinates)
 
I now want to move the values in the grid, so that for example
 

x = 0, y = 0, z = 0
with the temperature value 30°C in that location and I move it to:

 x = x +100 
so that the new coordinates are :
x = 100, y = 0, z = 0
and the value has still to be 30°C
this is what I want to reach.
Hope I managed to explain that somehow.
 
Greets
Dmitri

Dmitri,

Please reply to the list rather than an individual so everyone can benefit from the conversation.

Yes, that explanation is exactly what I thought you were talking about. See this example for how to attach that temperature value to your grid points:

http://www.vtk.org/Wiki/Add_Miscellaneous_Data_to_Points_in_a_Polydata
http://www.vtk.org/Wiki/Add_Miscellaneous_Data_to_Cells_in_a_Polydata

I'm assuming the values are already in that type of array in your vtk file? If you can't get it from here please provide the vtk file and we'll take a look.

Thanks,

David

-----Integrierter Anhang folgt-----


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